top hen ripping feathers off all my other chickens?

just today my alpha whyandotte hen has been ripping feathers off all my chickens except rooster she walks and rips mostly butt and tail feathers off she seemed to be eating some but she is also trying to get to my chicks and rip off there feathers any idea why she is doing this and how to stop it??

if you can separate her for a few day and see if she gets over it while she's in 'time out'. It seems to take a chicken 3-4 days to forget about an unacceptable behavior is you deal with it right away.